[lldb-dev] Is there a way to inspect signaled stack?

Eugene Birukov via lldb-dev lldb-dev at lists.llvm.org
Fri Nov 13 11:22:25 PST 2015

I am running on Ubuntu Linux. I am using a custom debugger built upon LLDB C++ API using version 3.7.
The target program issues a lot of "legitimate" SIGSEGV signals that it handles itself. Its signal handler runs on a separate stack (it uses sigaltstack() and SA_ONSTACK). Now, sometimes a bug in the program causes SIGSEGV that the handler cannot deal with and it crashes. Now, when I load the core, I see stack frames for the signal handler stack, but what I really need are frames for the signaled stack. 
Of course, I have access to siginfo_t and ucontext_t, so I can try to use some unwind library, but that approach is far from ideal - the LLDB already has the unwinder. So, what should I do to get the set of SBFrame's that I can query about local variables, etc.? I mean, something like .cxr command in Windbg would be really handy... 
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